Polpun Boonmak2011-02-242011-02-242010-01-022010-01-02Srinagarind Medical Journal (SMJ); Vol. 23 No. 2 April-June 2008; 215-22http://imsear.searo.who.int/handle/123456789/134102Abstract not availableen-USAcademic Affairs, Faculty of Medicine, Khon Kaen University, KhonKaen, ThailandReview Articles